A multi-element study of ISUA iron-formation, W-Greenland

Meta-sediments from Isua, West Greenland were analyzed by instrumental thermal neutron activation analysis (ITNAA). These sediments are chemical precipitates having some layers of remarkably high Cr content. The latter were compared to Cr poor layers. It turned out that the Cr enriched layers had hi...

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Bibliographic Details
Main Author: Rast, U.
Format: Other/Unknown Material
Language:unknown
Published: 1983
Subjects:
GEOPHYSICS
Greenland
Online Access:http://hdl.handle.net/2060/19840012893
id ftnasantrs:oai:casi.ntrs.nasa.gov:19840012893
record_format openpolar
spelling ftnasantrs:oai:casi.ntrs.nasa.gov:19840012893 2023-05-15T16:26:50+02:00 A multi-element study of ISUA iron-formation, W-Greenland Rast, U. Unclassified, Unlimited, Publicly available JAN 1, 1983 application/pdf http://hdl.handle.net/2060/19840012893 unknown Document ID: 19840012893 Accession ID: 84N20961 http://hdl.handle.net/2060/19840012893 No Copyright CASI GEOPHYSICS Lunar and Planetary Inst. Workshop on a Cross Section of Archean Crust; p 71-75 1983 ftnasantrs 2016-06-11T22:53:55Z Meta-sediments from Isua, West Greenland were analyzed by instrumental thermal neutron activation analysis (ITNAA). These sediments are chemical precipitates having some layers of remarkably high Cr content. The latter were compared to Cr poor layers. It turned out that the Cr enriched layers had higher Ir and Ni contents than the samples from the Cr poor layers. Compared to phanerozoic samples the highest Ir contents are not extraordinarily higher than in a modern sediment, and the Cr poor layers, representing more or less phanerozoic shale. From the cratering record of the Moon one can assume a similar cratering of the Earth at about the time when the Isua rocks were formed. Other/Unknown Material Greenland NASA Technical Reports Server (NTRS) Greenland
institution Open Polar
collection NASA Technical Reports Server (NTRS)
op_collection_id ftnasantrs
language unknown
topic GEOPHYSICS
spellingShingle GEOPHYSICS
Rast, U.
A multi-element study of ISUA iron-formation, W-Greenland
topic_facet GEOPHYSICS
description Meta-sediments from Isua, West Greenland were analyzed by instrumental thermal neutron activation analysis (ITNAA). These sediments are chemical precipitates having some layers of remarkably high Cr content. The latter were compared to Cr poor layers. It turned out that the Cr enriched layers had higher Ir and Ni contents than the samples from the Cr poor layers. Compared to phanerozoic samples the highest Ir contents are not extraordinarily higher than in a modern sediment, and the Cr poor layers, representing more or less phanerozoic shale. From the cratering record of the Moon one can assume a similar cratering of the Earth at about the time when the Isua rocks were formed.
format Other/Unknown Material
author Rast, U.
author_facet Rast, U.
author_sort Rast, U.
title A multi-element study of ISUA iron-formation, W-Greenland
title_short A multi-element study of ISUA iron-formation, W-Greenland
title_full A multi-element study of ISUA iron-formation, W-Greenland
title_fullStr A multi-element study of ISUA iron-formation, W-Greenland
title_full_unstemmed A multi-element study of ISUA iron-formation, W-Greenland
title_sort multi-element study of isua iron-formation, w-greenland
publishDate 1983
url http://hdl.handle.net/2060/19840012893
op_coverage Unclassified, Unlimited, Publicly available
geographic Greenland
geographic_facet Greenland
genre Greenland
genre_facet Greenland
op_source CASI
op_relation Document ID: 19840012893
Accession ID: 84N20961
http://hdl.handle.net/2060/19840012893
op_rights No Copyright
_version_ 1766015829890039808

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